*Butler: *Participated in the Steelers’ 2017 rookie minicamp on a tryout basis…Played in 33 games over four seasons…Totaled 32 receptions for 381 yards (11.9 avg.) and five TDs.

*Poggi: *Played four years at Michigan, appearing in 44 games with 17 starts…Made 13 starts at fullback and four starts at tight end…Totaled nine career receptions for 68 yards and two career rushing attempts for six yards and one TD.

*Warren: *Played three years at Texas, appearing in 24 games with nine starts…Rushed for 1,150 career yards on 204 carries, averaging 5.6 yards per attempt and recording 13 TDs…Also totaled 23 receptions for 242 yards and two TDs.

In corresponding transactions, the Raiders have waived the following three players: